1. A pair of chemical substances (typically a fuel and an oxidizer) that are mixed together to produce thrust in a rocket or spacecraft engine.
Usage: technical; aerospace engineering; plural form

Examples

• The spacecraft uses bipropellants to achieve precise orbital maneuvers.
• Hydrazine and nitrogen tetroxide are common bipropellants used in satellite thrusters.
• Engineers selected bipropellants for their high specific impulse and reliability.
• The rocket's main engines burn bipropellants to generate the necessary thrust for launch.
• Bipropellants must be stored separately to prevent premature combustion.